package gdt.filters;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

/**
 * Servlet Filter implementation class EncodingFilter
 * Sets request and response character encoding
 */
public class EncodingFilter implements Filter {

	private String encoding;

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		request.setCharacterEncoding(encoding);
		response.setCharacterEncoding(encoding);
		chain.doFilter(request, response);
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig filterConfig) throws ServletException {
		String encodingParam = filterConfig.getInitParameter("encoding");
		if (encodingParam != null) {
			encoding = encodingParam;
		}
	}
	
	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// noting to do
	}

}
